(3)  
24-22-00/201, Manual Control

 (4)  
36-05-00/201, Pneumatic Systems

 B. Access
 (1)  
Location Zones 212 Left Air-Conditioning Equipment Bay 214 Right Air-Conditioning Equipment Bay

 (2)  
Access Panels (AMM 12-31-31/201) 3303 - Left Air-Conditioning Access Panel 3403 - Right Air-Conditioning Access Panel

 C. Procedure
 S 424-007
 (1)  Install the check valve:
 (a)  
Remove the duct covers.

 (b)  
Install the check valve.

 NOTE: The flow arrow must point forward.
____
 (c)  
Move the clamps onto the check valve.

 (d)  
Tighten the clamps.

 D. Do a Leakage Check of the Check Valve
 S 864-008
 (1)
Supply pneumatic power to the airplane (AMM 36-05-00/201).

 (2)
Set the applicable PACK switch to the AUTO position.

 S 794-013

 (3)  
Examine the check valve for leakage:

 S 864-009
 (a)  A small leak is satisfactory.
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737-300/400/500MAINTENANCE MANUAL
 (b)  A large leak must be repaired.
 E. Put the Airplane Back to Its Usual Condition
 S 414-010
 (1)  
Close the applicable access panel.

 S 864-014

 (2)  
Set the applicable PACK switch to the OFF position.

 S 864-011

 (3)  
Remove the pneumatic power from the airplane if it is no longer necessary (AMM 36-05-00/201).

 S 864-012

 (4)  
Remove the electrical power from the airplane if it is no longer necessary (AMM 24-22-00/201).

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 AIR CONDITIONING ACCESSORY UNIT - REMOVAL/INSTALLATION
______________________________________________________
 1.  General_______
 A.  The air conditioning accessory unit is installed in the E/E equipment compartment on the E3-2 shelf.
 TASK 21-51-06-004-009
 2.  Air Conditioning Accessory Unit Removal (Fig. 401)_______________________________________
 A.  References
 (1)  20-10-07/201, E/E Rack-Mounted Components
 B.  Access
 (1)  
Location Zone
 205 Electrical Compartment

 (2)  
Access Panel
 1201L Electronic Equipment Access Door

 C.  Procedure
 S 864-017
 (1) Open these circuit breakers and attach DO-NOT-CLOSE tags:
 (a)  On the main power distribution panel, P6: 1) 6A3, TEMP CONTROL AUTOMATIC R 2) 6A4, TEMP CONTROL AUTOMATIC L 3) 6C1, AIR CONDITIONING VALVES TURBOFAN R 4) 6C2, AIR CONDITIONING VALVES TURBOFAN L 5) 6C3, AIR CONDITIONING VALVES PACK R 6) 6C4, AIR CONDITIONING VALVES PACK L 7) 6D4, AIR COND OVERHEAT 8) 6E1, AIR CONDITIONING RAM MOD R 9) 6E2, AIR CONDITIONING RAM MOD L 10) 6E3, AIR COND RAM MOD CONTROL R 11) 6E4, AIR COND RAM MOD CONTROL L
 S 014-001
 (2)  Get access to the air conditioning accessory unit:
 (a)  
Open the access door, 1201L, for the electronic compartment.

 (b)  
Go to the E3-2 shelf.

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A 737-300/400/500MAINTENANCE MANUAL

AIR CONDITIONING ACCESSORY UNIT
Air Conditioning Accessory Unit Location
　
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